Traction-rail.



B. M. BOYNTON.

TRACTION RAIL. APPLICATION FILED MAY 31. 1910 Patented Nov. 22, 1910.

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UNITED STATES PATEN T OFFICE.-

TRACTION-RAIL.

Specification of Letters Patent.

Patented Nov. 22, 1910.

Application filed May 31, 1910. Serial No. 564,210.

To all whom it may concern:

Be it known that I, EBEN M. .BOYNTON, of

est Newbury. in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Traction-Rails, of which the following is a specificat-i'on.

This invention railway cars.

One object of the invention is to provide a rail of greater durability than those hitherto used, and another object is to provide a rail having a traction surface which Will afford a greater tractive quality than those hitherto used.

The'invention consists in a rail composed for "the most part of relatively soft metal relates to traction rails for such as soft steel, in the traction surface. of

which are embedded particles or grains of relatively hard material such as carborundum or other equivalent material. The virtue of the relatively soft body or base is that it will not chip or be. fractured by sudden shock, such as a shock received from a rolling wheel passing over a joint, frog or switch. The rail may be so soft as to be even slightly ductile, but of suflicient tenacity in its texture to withstand the load imposed upon it. A rail ofthis character is practically non-fracturable, and there is therefore little or no danger of'breakage. The presence of a great number ofsmall grains of extremely hard material embedded in=the traction surface of the rail lends the requisite hardness to withstand the wear occasioned by the wheels, and these grains, moresents a side elevation of over, increase the tractive quality of the rail by preventing to a large measure slipping of the driving Wheels.

Ofthe accompanying drawings forminga part of this specification, Figure 1 reprea rail partly broken grains of relatively away, said rail having 1n its tract on surhard material embedded face. Fig. 2 represents a rail.

The same reference characters indicate the same parts wherever they occur.

The rail is indicated at A. It is composed of relatively soft but tough metal such as open-hearth steel. The proportions of the rail and its cross section may, of course, be suited to the particular use for which it is intended. In the traction surface of the rail are embedded countless particles or grains B of relatively hard material such as carborundum. It isnot intended to limit the invention toany specific hard material, since particles of analogous material may be emb'edded' in substitution for carborundum.

It is obvious that the traction surface comprises soft and hard material, the hard material being adapted to withstand the Wear 'of rolling wheels, and the soft material serving to raintain the hard material in position and support the load. .The proportion of grains of the hard material will preferably predominate, so that the traction surface will consist mostly of relatively hard material, which, however, is 'non-fracturable for the reason that it is granular in form, the grains being confined in a mass by the duration of the rail is commensurate with the duration of the hard material.

Having thus explained the nature of my said invention and described a way of constructing and using the same, although without attempting to set forth all of the forms in which it may be made-or all of' the modes of its use, What Lclaim is:

1. A rail having a traction portion composed of relatively soft metal, and grains of relatively hard material embedded in said traction portion.

2. A metal, and grains of relatively hard material embedded in the'traction portion ofthe rail. Y 3. A rail'having a traction portion composed of grains of relatively hard material cross'section of the tion surface of the M11 consisting mostly vof said hard material.

surface, and a non-fracturable base, said traction surface being afforded by. relatively hard material in granular form embedded in said base. l

In testimony whereof I have aflixed my signature, in presence of two witnesses.

' EBEN -MOODY BOYNTON. Witnesses:

HENRY-O. GnsHMAN, P. W. Pnzzn'r'ri.

4. A rail having a relatively hard traction soft material. The soft material is therefore subjected to no appreciable wear, and the rail composed of relatively soft and a base of relatively soft metal, the trac- 

